The first new polio vaccines in 50 years are less likely to mutate into a dangerous form that causes disease.
So the researchers have genetically altered the weakened virus even further to make it much harder for it to start causing paralysis again.
Prof Raul Andino, from University of California San Francisco, said he was "super-proud" of the scientific effort showing the vaccine was "50 to 100 times more stable".A man in an iron lung, to keep him breathing after polio paralyses the chest muscles Since then, it has been used more than 650 million times - and, Dr Macadam said, "we've never seen a reversion" back to dangerous poliovirus., the researchers have detailed the creation of stable vaccines against polio types one and three.
Prof Alan Barrett, from the Sealy Institute for Vaccine Sciences, at the University of Texas, called the "super-engineered" vaccines a feat of "impressive science".Joseph Swan, from the World Health Organization and the Global Polio Eradication Initiative, said more stable vaccines were a "significant part" of the plan for a polio-free world.
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